12 Questions
What is the coordination number for square close packing?
4
What type of arrangement is found in hexagonal close packing?
ABAB
How are the spheres arranged in the two dimensional square close packed layers?
Exactly above each other
What type of lattice is formed in three dimensional close packing from two dimensional square close packed layers?
Simple cubic
What types of voids are created when the second layer is placed over the first layer in close packing?
Tetrahedral voids and octahedral voids
How are the third layer spheres placed in relation to the second layer in close packing?
The third layer spheres may cover the tetrahedral voids or the octahedral voids of the second layer.
What is the coordination number in a hexagonal close packed structure?
12
Give an example of an element that crystallizes in a cubic close packed structure.
Copper (Cu) or Silver (Ag)
What is the difference between the number of atoms shared in a corner and a face centred unit cell?
Corner: 1/8 of an atom, Face centred: 1/2 of an atom
How many atoms belong to a body centred unit cell?
1 atom
What is the coordination number and arrangement in close packing in one dimension?
Coordination number: 2, Each sphere is in contact with 2 neighbours
How are close packed structures generated in two dimensions?
By stacking rows of close packed spheres in two ways: Square and Hexagonal close packing
Test your knowledge on end centered unit cells and the distribution of particles at various lattice positions such as corners and face centers. Understand how atoms are shared by multiple unit cells in different configurations.
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